I can envision them planning for a lot of attendees being comped and transported there by the various casinos. Otherwise, I think you’re right, maybe $75 minimum to get in for standing room, and up from there if you want to rest your ass.
If that’s how it’s going to go, I’m thinking the A’s would become an America’s Team instead of a team for Vegas, and as such, I would expect ownership (backed by Baseball itself?) to compete for top talent and spend to get it, at least initially. Because there is nationwide gambling revenue to be made on a situation like this, and Baseball can’t afford to blow this once in a lifetime opportunity.